EIGENMANN: the freshwater fishes of BRITISH GUIANA 21 



73. Centrarchus ? vittatus Schomburgk, p. 161, Loc? = ? 



pi. 14. 



74. Centrarchus f? rostratus Schomburgk, p. Rio Negro. 4.4 inches. = Acaropsis nassa 



163, pi. 15. (Heckel). 



*75. Centrarchus f cyanopterus Schomburgk, p. Essequibo. 3 in. = ? Cichlasoma bimaculalum 



165, pi. 16. (Linnseus). 



76. Pomolis ? fasciatus Schomburgk, p. 169, Rios Padauiri and Negro. 8.5 in. 



pi. 17. 



*77. Pomotis ? bono Schomburgk, p. 171, pi. 18. All rivers, and in pools and marshes. 6.5 in. = 



Mquidens tetramerus (Heckel). 



78. Gynmotus electricus Linnaeus, p. 173, pi. Rio Negro. = Eleclrophorus electricus (Linnaius). 



18. 



79. Gymnotus fasciatus Pallas, p. 174, pi. 19. Rio Branco. = Gymnotus carapo Linnaeus. 



80. Trififon /iisirix.^ D'Orbigny, p. 180, pi. 20. River Roowa. 12 inches. = Potamotrygon hys- 



trix (Muller & Henle). 



81. Trygon garrapa Schomburgk, p. 182, pi. Rio Branco. = Potamotrygon hyslrix (Muller & 



21. Henle). 



82. Trygon strongijlopterus Schomburgk, p. Rio Branco. = Paratrygon strongylopterus 



183, pi. 22. (Schomburgk). 



83. Elipesurus spinicauda Schomburgk, p. Rio Branco. 



184, pi. 23. 



84. Silurus parkeri Trail, p. 188, pi. 24. = Sciadeichthys parkeri (Trail). 



The brother, Richard Schomburgk, in the expeditions which have been men- 

 tioned, ascended the Demerara River to near the "Great Fall," He also threaded 

 the Pomeroon, Waini, and Barima Rivers, which discharge their waters west of 

 the Essequibo. He ascended the Essequibo to the Rupununi, following the latter 

 to near its sources. From Pirara he ascended the Takutu to its source and de- 

 scended it to Fort San Joaquin, whence he went to Roraima. His last collections, 

 made on the trip to Roraima, were all lost. 



An account of his journeys was published in two volumes under the title 

 "Reisen in British Guiana in den Jahrcn 1840-1844 im Auftrag Sr. Majestat des 

 Konigs von Preussen." His collections were enumerated in a third volume. The 

 new fishes were largely described in the "Horse Ichthyologicae," by Miiller & 

 Troschel, who also prepared the account of the fishes in this third volume. He gives 

 m.any notes on the habits of the fishes in the first two volumes. Muller & Troschel 

 enumerate one hundred and forty-one species as repre.sented in his collections.'" 

 Most of these I had an opportunity of examining in the Zoological Museum in 



'»To these Schomburgk adds ten species known to him, but not recognized by MiiUer and Troschel. 

 Some of these, like Myletes pacu, as Schomburgk himself noted, were given by Muller & Troschel under other 



